ATLANTA -- Dillon Gee underwent surgery to repair a damaged portion of the artery in his shoulder on Friday in St. Louis. Dr. Robert Thompson of Barnes-Jewish Hospital performed the procedure.

The Mets said Gee would be discharged from the hospital Tuesday or Wednesday.

The team did not identify a targeted return date, but a source familiar with the plan told ESPNNewYork.com that Gee likely is done for the season. There remains only an outside chance Gee returns in late September, or October if the Mets reach the postseason.

Bobby Parnell, who had a clot in the middle finger of his pitching hand early last season that led to numbness, noted his issue paled in comparison to Gee's situation. Still, Parnell continues to take aspirin every two to three days to help thin his blood and guard against future clots. He was not confident the issue was resolved until early this season, when he pitched in cold weather without experiencing a recurrence of the numbness.